From d9ffd8518acce98937759ac4be7cb2dd85ec0398 Mon Sep 17 00:00:00 2001
From: Michael Aherne <michael.aherne@strath.ac.uk>
Date: Tue, 22 Dec 2015 16:01:06 +0000
Subject: [PATCH] MDL-52589 cache: Allow unused stores to be uninstalled

---
 lib/classes/plugininfo/cachestore.php | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/lib/classes/plugininfo/cachestore.php b/lib/classes/plugininfo/cachestore.php
index cf3aeac6942..28cc82feb59 100644
--- a/lib/classes/plugininfo/cachestore.php
+++ b/lib/classes/plugininfo/cachestore.php
@@ -26,11 +26,17 @@ namespace core\plugininfo;
 defined('MOODLE_INTERNAL') || die();
 
 /**
- * Class for admin tool plugins
+ * Class for cache store plugins
  */
 class cachestore extends base {
 
     public function is_uninstall_allowed() {
-        return false;
+        $instance = \cache_config::instance();
+        foreach ($instance->get_all_stores() as $store) {
+            if ($store['plugin'] == $this->name) {
+                return false;
+            }
+        }
+        return true;
     }
 }